Machine for making tapered threaded sockets



(No Model.)

M. BLAKEY.

MACHINE FOR MAKING TAPERED THREADBD USOGKETS. No. 312,700. Patented P eb. 24. 1885.

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UNITED STATES PATENT OEEICE.

MILDBED BLAKEY, OF ALLEGHENY CITY, PENNSYLVANIA.

MACHINE FR MAKING TAPERED THREADED SOCKETS.

SPECIFICATION forming part of Letters Patent No. 312,700, dated February 24.-, 1885.

Application filed July 11, 1884. (No model.)

To all whom it may concern,.-

Be it known that I, MILDRED BLAKEY, of Allegheny City,in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Machines for Making Tapered Threaded Sockets and I do hereby declare the following to be a full,.clear, and exact description thereof.

My invention consists of an improved machine for making tapered sockets for connecting the ends of gas and similar pipes. Formerly these sockets were always made with a threaded bore of uniform diameter, so that when they were screwed onto the 4pipe the rst thread only could take hold, and to secure the pipe required to be turned as many times as there were turns in the thread in the distance it wasinserted. The later practice has been to make the sockets with a portion oftheir length tapered slightly on the inner or threaded portion, so that the end of the pipe could be entered sufficiently for a number of threads to take hold. This taper is made to extend various distances into the socket, according to the wish of the maker.

My machine, while adapted to tapering the sockets to any extent, is especially itted for cutting the double taper shown in Figure 6.

' To enable others skilled in the art to make and use my invention, I will now describe it by reference to the accompanying drawings, in which- Y Fig. 1 is an elevation, partly in section, of my improved machine. Fig. 2 is a plan View, also partly in section. Figs. 3, 4, and 5 are details, and Fig. 6 is a sectional view of a socket after it has been threaded on my improved machine.

Like letters of reference indicate like parts in each.

On a suitable bed, a, is a housing or frame, Z), of a hollow revolving chuck, c. Formed in one piece with the chuck c, or fastened thereto, is a gear-wheel, d, into which a driving-pin ion, e, mounted' on a shaft, e', meshes. The housing b, with its chuck c, stands slightly angling to the bed a, as shown in Fig. .2.- EX- tending lengthwise of the bed are guides a', upon which the standards a2 of the lathe-centers f g are placed. The standards a2 are fastened together by rods a3, so as to form a frame for sustaining the cutter-bar. Between the two centers f g a cutter-bar, h, provided with cutters h h2, is placed 7being removably secured by means of the screw-spindle g', which can be operated by the wheel g2. The spindle is held in its adjusted position by means of a locking cam or dog, g3. One end ofthe chuck c is provided with a solid ange, c', which is formed with recesses or notches c2. A collar, t', having radial projections z", which are counterparts of the recesses c2, is placed in the chuck c, inside of the flange c', and there secured, after being inserted, by turning the lugs i past the recesses c2, so that they come opposite to the lugs c3 of the iange c. The

opposite end of the chuck c is threaded, as at c4, for the reception of the threaded sleeve 7c of a ily-wheel, k. The sleeve k bears against a collar, p, which is provided with a projecting flange or shoulder, p', near its inner end, which corresponds to the iiange or shoulder z'Z-of the collar i. The purpose of this construction is to secure the socketl in place in the chuck c. This is done by turningthe collar t' until its projections z" coincide with the recesses c of the flange c', and then slipping it out of place. The socket l is then inserted and the collar i put back in place. By screwing up the sleeve 7c the socket will be secured between the shoulders i and p', as shown in Fig. 1, and be ready for the operation thereon of the cutters h h2. The cutter-bar h is then put in place between the centers f andg, and the machine is in the condition shown' in Fig. 2, and is ready to begin to operate upon the socket. The teeth of the driving-pinion e extend angling across the face, as shown at e2, to enable it to drive the angled wheel d. The axial movement is given to the cutter-bar frame by means of a screw-shaft, m, mounted on the frame a, and communicating motion to the cutter-frame by means of a nut, n, on one of he standards a2. The screw m is driven from the shaft e by means of gearing n. The shaft e is driven in any usual. manner.

The operation of my improved machine is as follows: The socket l being put in place in the chuck c, and the cutter-bar being secured between the centers f and g, with the cutters h h2 in the position shown in Fig. 2, power is applied to the chuck c by means of the pinion e and gear-wheel d, and at the same time to the center standards, ai, so as to cause the chuck c IOO to turn and the cutter-bar to travel axially. l The angled position of the socket Z soon causes the cutter-7L to come in contact with its inner surface at a point midway between its ends,

whenA it will cut the socket tapering from the middle to the end and form a thread on the tapered surface. At the same time the cutter if encounters the other end ot' the socket,and

by reason ofthe angling position of the latter cuts a thread from the end to the middle ofl the socket, tapering that end simultaneously with and to the same degree as the other end is tapered by the cutter 7L. When this operation is completed the machine is stopped, the cutter-bar h loosened by means of the screw g' and removed, the collar z' taken out, and then the socket Z is removed and replaced by an unthreaded socket and the operation repeated.

Vhile I have shown my machine provided with two cutters, 7L h2, I do not limit myself' thereto, for the reason that I can use the machine with one bit, and if a double tapered socket has to be produced I can make it by reversing its position and subjecting it to two cutting operations. Y

The cutter or cutters may be arranged for cutting a tapered thread of any desired length either throughout the whole or part only of the length of the socket.

If desired, the screw m may be applied to the housing b so as to give it an axial as well as a rotary movement, the cutter-bar in such case being stationary. This is an obvious change, and can be easily madeby the skilled mechanic. Y

I do not limit myself to any particular manner of holding or chucking the socket, as there are many obvious and known ways by which it may be done.

The machine is simple in its construction and easy and efficient in operation.

That I claim as my invention, and desire to secure by Letters Patent, is-

l. In a machine for producing a tapered threaded surface on the inside of pipe-sockets, the combination of ahollow rotatory chuck for supporting the socket during the threading operation in an angling position to the cutterbar, with a cutter-bar extending through said chuck and provided with one or more threading-bits, the said chuck or cutter-stock having an axial movement, substantially as and for the purposes described.

2. In a machine for producing threaded tapered surfaces on the inside of sockets, a cutter-bar having an axial movement, and carrying the cutters,in combination with a rotatory head which supports the socket in an angling position to the stock, and means for communieating an axial movement to the tool-stock anda rotatory movement to the sock et-holder, substantially as and for the purposes described.

In testimony whereof I have hereunto set my hand this 8th day of July, A. D. 1884.

MIL'DRED BLAKEY.

fitnessesz B. CoRwlN, THOMAS W. BAKEWELL. 

